Products / Magnetic Formwork Systems / Precast Accessories / Turnbuckle®


The BT-Spannschloss® turnbuckle is part of an easy to use connection system – without additional materials and tools. The BT-Spannschloss® turnbuckle enables efficient and precise assembly and durable connections for precast concrete elements. By using BTSpannschloss® turnbuckle and corresponding connection materials, precast elements can be joined without using mineral grouting. This means no curing or standstill times due to low temperatures. The BT-Spannschloss® turnbuckle can be fully loaded straight away. You can view the application of BT-Spannschloss® in our product video. The building inspection approval (Z-14.4-599) certifies the reliability of the product. The BT-Spannschloss® turnbuckle is offered in three sizes – M12, M16 and M20. Available in galvanised or stainless steel.


– Dry screw connection

– No joint grouting, no special tools

– Can be loaded immediately, no curing times

– Assembly regardless of weather, even in low temperatures or precipitation

– Able to be disassembled – removal of temporarily installed structures

– Three-point connection possible


– Angle support walls in flood protection

– Residential and commercial construction

– Agricultural systems

– Sewer and civil engineering

– Temporary structures


Turnbuckle® Technical Information
Precast Product Catalogue
Product CodeDescriptionSize
BTI099BT Turnbuckle Spannschloss M12 Set GalvEach
BTI100BT Turnbuckle Spannschloss M16 Set GalvEach
BTI101BT Turnbuckle Spannchloss M20 Set GalvEach
BTI149Magnetic Former for BT Turnbuckle Spannschloss M12Each
BTI150Magnetic Former for BT Turnbuckle Spannschloss M16Each
BTI151Magnetic Former for BT Turnbuckle Spannschloss M20Each